The medevac expert panel that Home Affairs Minister Peter Dutton said would open the "floodgates" and admit sick refugees and asylum seekers to Australia has been used nine times since the law passed, with the vast majority of all medevac applications being waved through by the government before reaching the final medical body.

The government has approved 31 medical transfers since the medevac law came into effect four months ago. As of Friday, nine refugees and asylum seekers had their applications rejected by the government – the medevac expert panel, reviewing the decisions, overturned two and upheld seven.

Home Affairs Minister Peter Dutton said "floodgates will open" due to the medevac law.Credit:Alex Ellinghausen

Due to a delay between the initial approval and a patient's treatment, 22 of the 31 approved have been transferred out of detention.

The transfer numbers – the first time such figures have been revealed since the medevac law passed – go against claims made by Mr Dutton that "floodgates" would open if doctors had greater power in deciding which refugees and asylum seekers could come to Australia for medical aid.

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Under the medevac law, a bill which the Coalition opposed, an independent panel of expert medical professionals have the final say on all offshore detainees seeking mainland treatment, unless they pose a risk to national security or have a serious criminal conviction.

Any two licensed doctors can ask the panel to consider an offshore detainee's case.

Mr Dutton last week ramped up criticisms of the law ahead of the government's attempts to repeal the legislation when Parliament resumes in early July, saying the law gave doctors too much power.

"I do fear that this opens the floodgates ... it sends a bad signal when you have a country like ours being dictated by doctors who can say that people must come here," he said on Thursday.

The Home Affairs Minister also suggested the medical panel would side with refugees and asylum seekers.

"I think generally you would expect the medical review panel would overturn a minister's decision that refuted the original claim made by the two doctors."

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Labor home affairs spokeswoman Kristina Keneally said in response that the expert panel was exercising restraint.

"In the past, the government has made ridiculous claims that hundreds of people would be transferred almost immediately to Australia because of medevac – that has not happened," the former NSW premier said.

Mr Dutton refreshed his medevac law attack following a Federal Court decision, handed down on Wednesday, that declared doctors need not make personal contact with refugees and asylum seekers on Nauru before recommending their case to the expert panel.

The government will seek to repeal the medevac legislation when it returns to Parliament in early July.

Following the federal election the government has the numbers to pass any repeal bill through the lower house, but could be denied by an all-powerful crossbench in the Senate if Labor continues to support medevac.

Returning Tasmanian senator Jacqui Lambie has emerged as the deciding vote on the legislation but has remained quiet about her vote intentions since being officially declared elected last week.